The Satoh ST-2640 is a compact utility tractor produced from 1977 to 1982. It features a Mitsubishi 1.3L 4-cylinder liquid-cooled diesel engine producing 25.6 hp (19.1 kW). The tractor has a 15-speed transmission with 15 forward and 3 reverse gears and four-wheel drive. It includes a rear PTO with a 540 rpm (1.375 inch) shaft.